There is evidence of great floods going back a long time. It makes sense as the ice age ended it would have released a lot of water. As things warmed up…that drip, drip, drip would turn into a torrent.
Did that flood out the alien power plants in Egypt? Why not? LOL
Yes the end of the ice age may have had a lot to do with it. Did it end slowly or suddenly and catastrophically? Or something in between? It would have been around 12,000 years ago abouts.